WO2015135431A1

WO2015135431A1 - Method for selecting d2d transmission resource pool and d2d transmission ue

Info

Publication number: WO2015135431A1
Application number: PCT/CN2015/073606
Authority: WO
Inventors: 赵亚利; 曾二林
Original assignee: 电信科学技术研究院
Priority date: 2014-03-14
Filing date: 2015-03-04
Publication date: 2015-09-17
Also published as: CN104918330A; CN104918330B

Abstract

Disclosed are a method for selecting a D2D transmission resource pool and a D2D transmission UE. The method comprises: a D2D transmission UE selecting a target signal source according to reference signal strength of signal sources corresponding to D2D transmission resource pools and/or priorities of the signal sources; and the D2D transmission UE selecting a corresponding D2D transmission resource pool according to reference signal strength and/or a priority of the target signal source. Embodiments of the present application provide a solution for selecting a D2D transmission resource pool. The D2D transmission resource pool is selected according to the reference signal strength of a signal source and/or the priority of the signal source, so as to ensure that the D2D transmission UE while moving can select a suitable D2D transmission resource pool to transmit a D2D Discovery/Communication message.

Description

Method for selecting D2D transmission resource pool and D2D transmitting UE

This application claims the priority of the Chinese patent application filed on March 14, 2014, the Chinese Patent Office, the application number is 201410097698.3, and the application name is "a D2D transmission resource pool selection method and a D2D transmission UE". The citations are incorporated herein by reference.

Technical field

The present application relates to the field of wireless communications technologies, and in particular, to a method for selecting a D2D transmission resource pool and a D2D transmitting UE.

Background technique

In the LTE (Long Term Evolution) system, the communication adopts the centralized control mode of the network, that is, the uplink and downlink data of the User Equipment (UE) are transmitted and received under the control of the network. The communication between the UE and the UE is forwarded and controlled by the network. There is no direct communication link between the UE and the UE. In this mode, the data transmission between the UE and the network can be referred to as D2N (Device to Network, device). To the network) transmission.

With the development of communication technology, a D2D (Device to Device) proximity service has been proposed.

In 3GPP (3rd Generation Partnership Project), D2D proximity services include the following two categories:

D2D Discovery: The UE uses E-UTRA to confirm that another UE is nearby. For example, a user can use the D2D UE to use the service to find nearby taxis, find friends nearby, and the like.

D2D Communication: By directly establishing a link between two mutually close UEs, the communication link originally transmitted through the network is converted into a local direct communication link, thereby saving a large amount of bandwidth and network efficiency; Or two UEs that are close to each other can use direct link communication to obtain stable high-speed and low-cost communication services. Proximity service communication is generally performed under the control or assistance of the network side, and the eNB (Evolved Base Station) may even dynamically allocate resources for the UE performing the proximity service communication.

For ease of description, two types of links can be defined:

D2D link: refers to the link between the device and the device for direct communication;

D2N link: A link between a device and a network node for communication.

In addition, UEs participating in D2D Discovery/Communication are divided into two roles:

D2D transmitting UE: a UE that transmits a D2D Discovery/Communication message;

The D2D receives the UE: that is, the UE that receives the D2D Discovery/Communication message sent by the D2D transmitting UE.

For D2D Discovery, 3GPP currently defines two types of resource allocation:

Type 1 (Type1): that is, the D2D sending UE selects one in a D2D Discovery sending resource pool by itself. The resource sends a D2D Discovery message;

Type 2: The D2D transmitting UE performs D2D Discovery message transmission on the resources allocated by the network. According to the D2D Discovery message allocated by the network, whether the resource is dynamic or semi-static, Type 2 can be divided into Type 2A and Type 2B resource allocation types. For Type 2A, the network dynamically allocates resources used by the D2D Discovery message transmission for the D2D. For Type 2B, the network sends the UE semi-statically allocated resources for D2D Discovery message transmission for the D2D.

For a UE in the D2N idle (IDLE) state, since it does not establish an RRC connection with the base station, when the IDLE UE transmits the UE as a D2D, its D2D Discovery resource allocation type can only select Type1.

For D2D Communication, 3GPP currently defines two types of resource allocation:

Mode 1 (Mode1): that is, the network scheduling D2D sends the resources used by the UE for D2D transmission.

Mode 2 (Mode 2): The D2D transmitting UE selects a resource in the D2D Communication transmission resource pool to transmit the D2D Communication message.

For the UE in the D2N IDLE state, since it does not establish an RRC connection with the base station, when the IDLE UE transmits the UE as the D2D, the D2D Communication resource allocation type can only select Mode2.

For UEs in the RRC connected state, the resource allocation type of D2D Discovery/Communication is controlled by the network. However, for a UE in an RRC idle state or an off-network UE, the resource allocation type of the D2D Discovery/Communication cannot be controlled by the network. For the D2D Discovery scenario, the resource allocation type of the D2D transmitting UE can only be selected by Type1; for the D2D Communication scenario, The resource allocation type of the D2D transmitting UE can only select Mode2. For these UEs, it may receive the D2D transmission resource pool of the serving cell and the D2D transmission resource pool of the neighboring cell at the same time, and even receive the D2D transmission resource pool forwarded by the relay UE. In this case, it is necessary to consider how the D2D transmitting UE performs D2D transmission resource pool selection.

For the D2D Discovery scenario, the D2D transmission resource pool refers to the D2D Discovery transmission resource pool. For the D2D communication scenario, the D2D transmission resource pool refers to the D2D Communication transmission resource pool.

Summary of the invention

The purpose of the application is to provide a method for selecting a D2D transmission resource pool and a D2D transmission UE to solve the problem of how to select from multiple D2D transmission resource pools.

The purpose of this application is achieved by the following technical solutions:

A method for selecting a D2D transmission resource pool includes:

The D2D transmitting UE selects a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and/or a priority of the source;

The D2D transmitting UE selects a corresponding D2D transmission resource pool according to the reference signal strength and/or priority of the target source.

The embodiment of the present application provides a selection scheme of a D2D transmission resource pool. The selection is based on the reference signal strength of the source and/or the priority of the source, etc., to ensure that the D2D transmitting UE can select a suitable D2D transmission resource pool for transmitting the D2D Discovery/Communication message when moving.

In the embodiment of the present application, the source of the D2D transmission resource pool may be, but is not limited to, a camping cell, a neighboring cell, and a relay of the D2D transmitting UE.

The relay may be, but is not limited to, a relay node in the cellular network, or may be a relay UE.

The priority of the source may be pre-configured, or may be sent by the D2D transmitting UE to the D2D transmitting UE by means of broadcast or the like.

In the embodiment of the present application, several preferred priority rankings are as follows:

Resident cell>neighbor cell>relay, or,

Resident cell = neighbor cell > trunk, or,

Resident cell = neighbor cell = relay

For example, the priority relationship between the camping cell and the neighboring cell is as follows: the camping cell>the neighboring cell means that the priority of the camping cell is greater than the priority of the neighboring cell, and the camping cell=neighboring cell refers to the camping cell. The priority is the same as the priority of the neighboring cell.

The reference signal of the source may be a specific signal, which can reflect the channel quality of the source, such as a cell reference signal (CRS) of the D2N network, and the like.

The preferred embodiment of selecting a target source is exemplified by taking a detectable source as a camping cell and a neighboring cell as an example.

One way to select the target source:

The D2D transmitting UE determines whether the reference signal strength of the neighboring cell satisfies the first predetermined condition;

If the reference signal strength of the neighboring cell satisfies the first predetermined condition, the D2D transmitting UE selects the neighboring cell as the target source;

If no reference signal strength of the neighboring cell satisfies the first predetermined condition, the D2D transmitting UE selects the camping cell as the target source.

The satisfying the first predetermined condition is that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference greater than the second threshold is greater than the first time threshold.

The value of the first time threshold is determined according to actual application requirements. In an extreme case, the value of the first time threshold may be 0.

The value of the second threshold is determined according to actual application requirements. Preferably, the second threshold value is a signal strength offset value corresponding to the D2D resource selection.

If the reference signal strength of the multiple neighboring cells satisfies the first predetermined condition, the neighboring cell with the highest reference signal strength may be selected as the target source, or one neighboring cell may be randomly selected as the target source, and other sources may be selected. The rule selects a neighboring cell as the target source.

Way 2 of selecting the target source:

The D2D sending UE determines whether the reference signal strength of the camped cell is greater than a first threshold;

If the reference signal strength of the camping cell is greater than the first threshold, the D2D transmitting UE selects the camping cell as the target source;

If the reference signal strength of the camping cell is not greater than (ie, less than or equal to) the first threshold, the D2D transmitting UE selects the target source in the manner described above.

The value of the first threshold is determined according to actual application requirements.

Way 3 of selecting the target source:

The D2D transmitting UE selects the source with the highest priority as the target source according to the priority of the source corresponding to the D2D sending resource pool.

If there are multiple highest priority sources, the source with the highest priority can be randomly selected as the target source, and the source with the highest reference signal strength can be selected as the target source.

Way 4 of selecting the target source:

The D2D sending UE determines whether the priority of the camped cell is greater than the priority of the neighboring cell;

If the priority of the camping cell is greater than the priority of the neighboring cell, the D2D transmitting UE determines whether there is a neighboring cell whose reference signal strength satisfies the second predetermined condition, and if so, selects a neighboring cell whose reference signal strength satisfies the second predetermined condition as a target Source, otherwise, select the resident cell as the target source;

If the priority of the camping cell is not greater than the priority of the neighboring cell, the D2D transmitting UE determines whether there is a neighboring cell whose reference signal strength satisfies the third predetermined condition, and if so, selects a neighboring cell whose reference signal strength satisfies the third predetermined condition Target source, otherwise, the camped cell is selected as the target source.

Wherein, satisfying the second predetermined condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference greater than the third threshold exceeds the second time threshold.

Wherein, satisfying the third predetermined condition means that the reference signal strength is greater than the reference signal strength of the camped cell, and the duration of the difference greater than the fourth threshold exceeds the third time threshold.

The values of the second time threshold and the third time threshold are determined according to actual application requirements. In an extreme case, the value of the second time threshold may be 0, and the value of the third time threshold may also be 0.

The values of the third threshold and the fourth threshold are determined according to actual application requirements.

Preferably, in practical applications, the third threshold may be set to be greater than the fourth threshold.

If the priority of the camping cell is greater than the priority of the neighboring cell, if the reference signal strength of the multiple neighboring cells satisfies the second predetermined condition, the neighboring cell with the highest reference signal strength may be selected as the target source. A neighboring cell can be randomly selected as the target source, and one neighboring cell can be selected as the target source according to other rules.

If the priority of the camping cell is not greater than the priority of the neighboring cell, if the reference signal strength of the multiple neighboring cells satisfies the third predetermined condition, the neighboring cell with the highest reference signal strength may be selected as the target source. A neighboring cell may be randomly selected as the target source, and one neighboring cell may be selected as the target source according to other rules.

Way 5 of selecting the target source:

If the reference signal strength of the camping cell is not greater than the first threshold, the D2D transmitting UE selects the target source according to the above manner.

If the source that can be detected is the camping cell and the relay, the implementation manner of selecting the target source can refer to the selection manner of each target source, and details are not described herein again.

If the source that can be detected is a camping cell, a neighboring cell, and a relay, and the priorities of the neighboring cell and the relay are the same, the implementation manner of selecting the target source may refer to the selection manner of each target source, and no longer Narration.

If the source that can be detected is a camping cell, a neighboring cell, and a relay, and the priority of the neighboring cell is greater than the priority of the relay. When selecting the target source, you can refer to the above methods one to three. If the priority of the camping cell is greater than the priority of the neighboring cell, if the neighboring cell meets the above conditions, it is determined whether there is a reference signal strength of the relay and the camping cell. The reference signal strength is greater than the relay of the fifth threshold whose duration exceeds the fourth time threshold, if any, the relay is selected as the target source, otherwise, the camped cell is selected as the target source; If the priority of the cell is not greater than the priority of the neighboring cell, if no neighboring cell meets the foregoing conditions, it is determined whether the reference signal strength of the relay is greater than the reference signal strength of the camping cell by a duration greater than the sixth threshold. The relay exceeding the fifth time threshold, if any, selects the relay as the target source, otherwise, selects the camped cell as the target source. You can also refer to the above method 5 when selecting the target source.

If the source that can be detected is a camping cell, a neighboring cell, and a relay, and the priority of the relay is greater than the priority of the neighboring cell. When selecting the target source, you can refer to the above methods one to three. When selecting the target source, you can also judge the resident cell first. Whether the priority of the priority is greater than the priority of the relay, and when the priority of the camped cell is greater than the priority of the relay, it is sequentially determined whether the relay and the neighboring cell satisfy the predetermined condition, and if the relay meets the predetermined condition, the priority is selected. As the target source, the camped cell is selected as the target source only when the relay and the neighboring cell do not satisfy the predetermined condition; when the priority of the camped cell is not greater than the priority of the relay, the relay and the neighbor are sequentially determined. Whether the cell satisfies the predetermined condition, if a relay meets the predetermined condition, the relay is preferentially selected as the target source, and the camped cell is selected as the target source only when neither the relay nor the neighboring cell meets the predetermined condition. Before determining whether the priority of the camping cell is greater than the priority of the relay, it may also be determined whether the reference signal strength of the camped cell is greater than the first threshold, and if the threshold is greater than the first threshold, the camped cell is selected as the target. Source, otherwise determine whether the priority of the camped cell is greater than the priority of the relay, and select the target source according to the above process.

Based on the same inventive concept as the method, the embodiment of the present application further provides a D2D sending UE, including:

a target source selection module, configured to select a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and/or a priority of the source;

The resource pool selection module is configured to select a corresponding D2D transmission resource pool according to the reference signal strength and/or priority of the target source.

Preferably, the target source selection module is used to:

Determining whether the reference signal strength of the neighboring cell or the relay satisfies the first predetermined condition, and satisfying the first predetermined condition is: the reference signal strength is greater than the reference signal strength of the camped cell, and the difference is greater than the duration of the second threshold Exceeding the first time threshold;

If the reference signal strength of the neighboring cell or the relay satisfies the first predetermined condition, the neighboring cell or the relay is selected as the target source;

If the reference signal strength of the neighboring cell or the relay does not satisfy the first predetermined condition, the camped cell is selected as the target source.

Preferably, the second threshold value is a signal strength offset value corresponding to the D2D resource selection.

Preferably, when it is determined whether the reference signal strength of the neighboring cell or the relay meets the first predetermined condition, the target source selection module is configured to:

Determining whether the reference signal strength of the camped cell is greater than the first threshold;

If the reference signal strength of the camping cell is greater than the first threshold, the camping cell is selected as the target source;

If the reference signal strength of the camping cell is less than or equal to the first threshold, determine whether there is a neighboring cell or a reference of the relay The test signal strength satisfies the first predetermined condition.

Preferably, the target source selection module is configured to:

According to the priority of the source corresponding to the D2D sending resource pool, the source with the highest priority is selected as the target source.

Preferably, the source includes: a camping cell, a neighboring cell, and a relay.

Preferably, the priority of the source is pre-configured or camped on the cell broadcast.

Preferably, the priority of the camping cell is greater than the priority of the neighboring cell, and the priority of the neighboring cell is greater than the priority of the relay; or the priority of the camping cell is equal to the priority of the neighboring cell, which is greater than the priority of the relay. Or, the priority of the camping cell, the neighboring cell, and the relay is the same.

Preferably, the target source selection module is configured to:

Determining whether the priority of the camped cell is greater than the priority of the neighboring cell and the relay;

If the priority of the camping cell is greater than the priority of the neighboring cell and the relay, determining whether there is a neighboring cell or a relay whose reference signal strength satisfies the second predetermined condition, and if so, selecting a neighbor whose reference signal strength satisfies the second predetermined condition The cell or the relay is used as the target source. Otherwise, the camped cell is selected as the target source. The second predetermined condition is that the reference signal strength is greater than the reference signal strength of the camped cell, and the difference is greater than the third threshold. The duration exceeds the second time threshold.

If the priority of the camping cell is less than or equal to the priority of the neighboring cell or the relay, determine whether there is a neighboring cell or a relay whose reference signal strength satisfies the third preset condition, and if so, select the reference signal strength to satisfy the third pre- The conditional neighbor cell or relay is used as the target source, otherwise, the camped cell is selected as the target source. Satisfying the third preset condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference greater than the fourth threshold exceeds the third time threshold.

Preferably, the third threshold is greater than the fourth threshold.

Preferably, when determining whether the priority of the camping cell is greater than the priority of the neighboring cell and the relay, the target source selection module is configured to:

If the reference signal strength of the camping cell is greater than the first threshold, selecting the camping cell as the target source;

If the reference signal strength of the camping cell is less than or equal to the first threshold, it is determined whether the priority of the camping cell is greater than the priority of the neighboring cell and the relay.

Preferably, the reference signal of the source comprises: a cell reference signal.

Based on the same inventive concept as the method, the embodiment of the present application further provides a D2D transmitting UE, including a processor and a memory.

The processor is configured to execute a computer program having the following functions: transmitting a source corresponding to the resource pool according to the D2D Selecting a target source according to a reference signal strength and/or a priority of the source; selecting a corresponding D2D transmission resource pool according to a reference signal strength and/or priority of the target source;

The memory is configured to store code for the above computer program.

DRAWINGS

FIG. 1 is a flowchart of a method provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a D2D transmitting UE according to an embodiment of the present application;

FIG. 3 is a schematic diagram of another D2D transmitting UE according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of another D2D transmitting UE according to an embodiment of the present application.

detailed description

The core idea of the embodiment of the present application is: in a D2D Discovery scenario or a D2D Communication scenario, the D2D transmitting UE determines which D2D to use according to the reference signal strength and/or priority corresponding to multiple D2D transmission resource pools that can be detected by the UE. Resource pool.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , the method for selecting a D2D transmission resource pool provided by the embodiment of the present application includes the following operations:

Step 100: The D2D sending UE selects a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and/or a priority of the source.

Step 110: The D2D transmitting UE selects a corresponding D2D transmission resource pool according to a reference signal strength and/or a priority of the target source.

Optionally, the D2D transmitting UE selects one of multiple resource pools of the target source according to signal strength and/or priority.

The priority of the source may be pre-configured, or may be a camped cell of the D2D transmitting UE by broadcasting or the like. The mode is sent to the D2D to send the UE.

Resident cell>neighbor cell>relay, or,

Resident cell = neighbor cell > trunk, or,

Resident cell = neighbor cell = relay

The reference signal of the source may be a specific signal, which can reflect the channel quality of the source, such as a CRS (Cell-specific Reference Signal) of the D2N network.

The reference signal strength may be, but is not limited to, RSRP (Reference Signal Receiving Power) of the reference signal, or RSRQ (Reference Signal Receiving Quality).

One way to select the target source:

The D2D transmitting UE determines whether the reference signal strength of the neighboring cell satisfies the first predetermined condition; if the reference signal strength of the neighboring cell satisfies the first predetermined condition, the D2D transmitting UE selects the neighboring cell as the target source; if there is no reference of the neighboring cell The signal strength satisfies the first predetermined condition, and the D2D transmitting UE selects the camping cell as the target source.

Wherein, satisfying the first predetermined condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference greater than the second threshold exceeds the first time threshold.

In the D2D Discovery scenario, it is assumed that the D2D transmitting UE (hereinafter referred to as the UE) in the D2N IDLE state resides in the cell A (Cell A), and the D2D Discovery sending resource pool is selected as follows:

The UE performs the neighbor cell measurement, which may be, but is not limited to, determining the CRS, synchronization signal, etc. of the neighboring cell. A neighboring cell, such as Cell B, is detected.

Let the CRS signal strength of the D2N link of Cell A be S _{Serving_cell} , the CRS signal strength of the D2N link of the neighboring cell Cell B be S _{neighbour_cell_B} , and the offset is the signal strength offset value corresponding to the D2D resource selection, then once the Cell B and the Cell are selected The CRS signal strength of A satisfies: S _{neighbour_cell_B} _≥ S _{Serving_cell} + offset, and after a certain time (first time threshold), the UE selects the D2D Discovery transmission resource pool corresponding to Cell B, that is, obtains the Cell from the system information of Cell B. B's D2D Discovery sends a resource pool and selects the resources used for D2D Discovery messaging.

For the selection method of the D2D transmission resource pool in the D2D communication scenario, refer to the foregoing process, and details are not described herein.

Way 2 of selecting the target source:

In the D2D Dicovery scenario, it is assumed that the D2D transmitting UE (hereinafter referred to as the UE) in the D2N IDLE state resides in the cell A (Cell A), and the D2D Dicovery sending resource pool is selected as follows:

If the D2N link CRS signal strength (RSRP or RSRQ) of the Cell A is greater than the first threshold, the UE does not perform neighbor cell measurement, and selects to use the D2D Dicovery transmission resource pool corresponding to Cell A. When the D2D Dicovery message needs to be sent, the UE selects a resource from the D2D Dicovery transmission resource pool broadcasted by the Cell A to transmit.

With the movement of the UE, when the D2N link CRS signal strength of the Cell A is less than or equal to the first threshold, the UE performs the neighbor cell measurement, which may be, but is not limited to, detecting the CRS, the synchronization signal, etc. of the neighboring cell. Go to a neighboring cell, such as Cell B.

Let the CRS signal strength of the D2N link of Cell A be SServing_cell, the CRS signal strength of the D2N link of the neighboring cell Cell B be S _{neighbour_cell_B} , and the offset is the signal strength offset value corresponding to the D2D resource selection, then once Cell B and Cell A The CRS signal strength satisfies: S _{neighbour_cell_B} _≥ S _{Serving_cell} + offset, and after a certain time (first time threshold), the UE decides that the D2D Dicovery transmission resource pool needs to be switched, that is, the release of Cell A's D2D Dicovery is sent from the cloud. Obtain the D2D Dicovery transmission resource pool of Cell B from the system information of Cell B, and select the resource used for D2D Dicovery message transmission.

Way 3 of selecting the target source:

In the D2D Dicovery scenario, it is assumed that the D2D transmitting UE (hereinafter referred to as UE) in the D2N IDLE state resides in the cell A (Cell A), and the D2D Dicovery sending resource pool is selected as follows:

If the CRS strength of the D2N link of the Cell A is higher than the first threshold, the UE does not perform the neighbor cell measurement, and when the D2D Discovery message needs to be sent, the UE selects the resource from the D2D Discovery transmission resource pool broadcasted by the Cell A. .

As the UE moves, when the D2N link CRS signal strength of Cell A is lower than the first threshold, the UE starts performing detection of other synchronization signals. It is assumed that a synchronization signal of a relay is detected.

If the source priority is as follows: camped cell>relay UE, the UE preferentially selects the D2D Discovery sending resource pool of the camping cell;

If the source priority is as follows: camped cell = relay UE, the UE may randomly select a D2D Discovery transmission resource pool of one of the sources.

Way 4 of selecting the target source:

Satisfying the second predetermined condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference greater than the third threshold exceeds the second time threshold.

Satisfying the third predetermined condition means that the reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference greater than the fourth threshold exceeds the third time threshold.

When the priority of the camping cell is the highest, it is desirable to preferentially select the camping cell as the target cell. Preferably, in practical applications, the third threshold may be set to be greater than the fourth threshold.

If the priority of the camping cell is greater than the priority of the neighboring cell, if the reference signal strength of the multiple neighboring cells is greater than the third threshold, the reference signal strength may be selected from the maximum. As the target source, the neighboring cell may also randomly select one neighboring cell as the target source, and may also select one neighboring cell as the target source according to other rules.

Wherein, for the case that the priority of the camping cell is not greater than the priority of the neighboring cell, if the reference signal strength of the plurality of neighboring cells is greater than the fourth threshold value, the reference signal strength may be selected therefrom. The largest neighboring cell is used as the target source, and a neighboring cell can be randomly selected as the target source, and one neighboring cell can be selected as the target source according to other rules.

The UE performs neighbor cell measurement, which may be, but is not limited to, detecting a neighboring cell, such as Cell B, when detecting a CRS, a synchronization signal, or the like of the neighboring cell.

The UE determines, according to the obtained priority information, whether the priority of the Cell A is greater than the priority of the Cell B.

If the priority of Cell A is greater than the priority of Cell B, only the CRS signal strength of the D2N link of Cell B is greater than the third threshold of the D2N link CRS signal strength of Cell A, and the duration exceeds the second time. When the threshold is set, the D2D Discovery of the Cell B is selected to send the resource pool. In other cases, the D2D Discovery of the Cell A is used to send the resource pool.

If the priority of Cell A is equal to the priority of Cell B, only the reference signal strength needs to be considered, that is, the D2N link CRS signal strength of Cell B is greater than the fourth threshold of the D2N link CRS signal strength of Cell A, and continues. When the time exceeds the third time threshold, the D2D Discovery of Cell B is selected to send the resource pool. In other cases, the D2D Discovery of Cell A is sent to the resource pool.

Preferably, the third threshold is greater than the fourth threshold.

Preferably, the fourth threshold value is the same as the second threshold value, and the third time threshold is the same as the first time threshold.

For the selection method of the D2D transmission resource pool in the D2D communication scenario, refer to the above process. Let me repeat.

Way 5 of selecting the target source:

In the D2D Dicovery scenario, it is assumed that the D2D transmitting UE (hereinafter referred to as the UE) in the D2N IDLE state resides in the cell A (Cell A), and the implementation manner of selecting the D2D Dicovery sending resource pool according to the above manner is as follows:

Preferably, the third threshold is greater than the fourth threshold.

If the source that can be detected is a camping cell, a neighboring cell, and a relay, and the neighboring cell and the relay have the same priority, For the implementation method of selecting the target source, refer to the selection method of each target source mentioned above, and details are not described herein again.

If the source that can be detected is a camping cell, a neighboring cell, and a relay, and the priority of the relay is greater than the priority of the neighboring cell. When selecting the target source, you can refer to the above methods one to three. When the target source is selected, the priority of the camped cell may be determined to be greater than the priority of the relay. When the priority of the camped cell is greater than the priority of the relay, the relay and the neighboring cell are sequentially determined to meet the predetermined condition. If a relay meets the predetermined condition, the relay is preferentially selected as the target source, and the camped cell is selected as the target source only when the relay and the neighboring cell do not satisfy the predetermined condition; the priority of the camped cell is not greater than When the priority is followed, it is sequentially determined whether the relay and the neighboring cell satisfy the predetermined condition. If the relay meets the predetermined condition, the relay is preferentially selected as the target source, and only when the relay and the neighboring cell do not satisfy the predetermined condition, The camped cell is used as the target source. Before determining whether the priority of the camping cell is greater than the priority of the relay, it may also be determined whether the reference signal strength of the camped cell is greater than the first threshold, and if the threshold is greater than the first threshold, the camped cell is selected as the target. Source, otherwise determine whether the priority of the camped cell is greater than the priority of the relay, and select the target source according to the above process.

Based on the same inventive concept as the method, the embodiment of the present application further provides a D2D transmitting UE, as shown in FIG. 2, including:

The target source selection module 201 is configured to select a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and/or a priority of the source;

The resource pool selection module 202 is configured to select a corresponding D2D transmission resource pool according to the reference signal strength and/or priority of the target source.

Preferably, the target source selection module 201 is configured to:

Preferably, when it is determined whether the reference signal strength of the neighboring cell or the relay meets the first predetermined condition, the target source selection module 201 is configured to:

If the reference signal strength of the camping cell is less than or equal to the first threshold, it is determined whether the reference signal strength of the neighboring cell or the relay satisfies the first predetermined condition.

Preferably, the target source selection module 201 is configured to:

If the priority of the camping cell is less than or equal to the priority of the neighboring cell or the relay, determine whether there is a neighboring cell or a relay whose reference signal strength satisfies the third preset condition, and if so, select the reference signal strength to satisfy the third pre- The conditional neighbor cell or relay is used as the target source, otherwise, the camped cell is selected as the target source. Satisfying the third preset condition means that The reference signal strength is greater than the reference signal strength of the camping cell, and the duration of the difference greater than the fourth threshold exceeds a third time threshold.

Preferably, the third threshold is greater than the fourth threshold.

Preferably, when it is determined whether the priority of the camping cell is greater than the priority of the neighboring cell and the relay, the target source selecting module 201 is configured to:

Based on the same inventive concept as the method, the embodiment of the present application further provides a D2D transmitting UE, as shown in FIG. 3, including a processor 301 and a memory 302.

The processor 301 is configured to execute a computer program having the following functions: selecting a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and/or a priority of the source; and determining a reference signal strength according to the target source / or priority to select the corresponding D2D transmission resource pool;

The memory 302 is configured to store code of the above computer program.

Based on the same inventive concept as the method, the embodiment of the present application further provides a D2D transmitting UE, as shown in FIG.

The processor 401 is configured to read a program in the memory 404 and perform the following process:

Selecting a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and/or a priority of the source; and selecting a corresponding D2D transmission resource pool according to the reference signal strength and/or priority of the target source.

The transceiver 402 is configured to receive and transmit data under the control of the processor 401.

Preferably, the processor 401 is configured to:

If no reference cell strength of the neighboring cell or relay satisfies the first predetermined condition, the camped cell is selected as the target message. source.

Preferably, when it is determined whether the reference signal strength of the neighboring cell or the relay meets the first predetermined condition, the processor 401 is configured to:

Preferably, the processor 401 is configured to:

Preferably, the third threshold is greater than the fourth threshold.

Preferably, when determining whether the priority of the camping cell is greater than the priority of the neighboring cell and the relay, the processor 401 is configured to:

In FIG. 4, a bus architecture (represented by bus 400), which may include any number of interconnected buses and bridges, will include one or more processors and memory 404 represented by general purpose processor 401. The various circuits of the memory are linked together. The bus 400 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art and, therefore, will not be further described herein. Bus interface 403 provides an interface between bus 400 and transceiver 402. Transceiver 402 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. For example, transceiver 402 receives external data from other devices. The transceiver 402 is configured to send the processed data of the processor 401 to other devices. Depending on the nature of the computing system, a user interface 405 can also be provided, such as a keypad, display, speaker, microphone, joystick.

The processor 401 is responsible for managing the bus 400 and the usual processing, running a general purpose operating system as described above. The memory 404 can be used to store data used by the processor 401 in performing operations.

Optionally, the processor 401 may be a CPU (Central Embedded Device), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device). , complex programmable logic devices).

It can be seen from the above that the embodiment of the present application provides a selection scheme of a D2D transmission resource pool, and selects according to the reference signal strength of the source and/or the priority of the source, so as to ensure that the D2D transmitting UE can select when moving. A suitable D2D transmission resource pool is used for sending D2D Discovery/Communication messages.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the present application has been described, it will be apparent that those skilled in the art can make further changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

A device-to-device D2D transmission resource pool selection method, comprising:

The D2D transmitting user equipment selects a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and/or a priority of the source;

The D2D transmitting user equipment selects a corresponding D2D transmission resource pool according to the reference signal strength and/or priority of the target source.
The method according to claim 1, wherein the D2D transmitting user equipment selects a target source according to a reference signal strength of a source corresponding to the D2D transmission resource pool, and includes:

The D2D transmitting user equipment determines whether the reference signal of the neighboring cell or the relay meets the first predetermined condition, and the satisfying the first predetermined condition is that the reference signal strength is greater than the reference signal strength of the camping cell, and the difference is greater than the first The duration of the second threshold exceeds the first time threshold;

If the reference signal strength of the neighboring cell or the relay meets the first predetermined condition, the D2D transmitting user equipment selects the neighboring cell or the relay as the target source;

If the reference signal of the neighboring cell or the relay satisfies the first predetermined condition, the D2D transmitting user equipment selects the camping cell as the target source.
The method according to claim 2, wherein the second threshold value is a signal strength offset value corresponding to the D2D resource selection.
The method according to claim 2 or 3, wherein the D2D transmitting user equipment determines whether the reference signal strength of the neighboring cell or the relay satisfies the first predetermined condition, including:

The D2D sending user equipment determines whether the reference signal strength of the camped cell is greater than a first threshold;

If the reference signal strength of the camping cell is greater than the first threshold, the D2D transmitting user equipment selects the camping cell as the target source;

If the reference signal strength of the camping cell is less than or equal to the first threshold, the D2D transmitting user equipment determines whether the reference signal strength of the neighboring cell or the relay satisfies the first predetermined condition.
The method according to claim 1, wherein the D2D transmitting user equipment selects a target source according to a priority of a source corresponding to the D2D transmission resource pool, and includes:

The D2D transmitting user equipment selects a source with the highest priority as the target source according to the priority of the source corresponding to the D2D sending resource pool.
The method according to claim 1, wherein the D2D transmitting user equipment selects a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and a priority of the source, including:

The D2D sending user equipment determines whether the priority of the camping cell is greater than the priority of the neighboring cell and the relay;

If the priority of the camping cell is greater than the priority of the neighboring cell and the relay, the D2D transmitting user equipment determines whether there is a neighboring cell or a relay whose reference signal strength satisfies the second predetermined condition, and if so, selects to satisfy the second reservation. The neighboring cell or relay of the condition is used as the target source. Otherwise, the camped cell is selected as the target source. The second predetermined condition is met: the reference signal strength is greater than the reference signal strength of the camped cell, and the difference is greater than the third gate. The duration of the limit exceeds the second time threshold;

If the priority of the camping cell is less than or equal to the priority of the neighboring cell or the relay, the D2D transmitting user equipment determines whether there is a neighboring cell or a relay whose reference signal strength satisfies the third predetermined condition, and if so, selects to satisfy the first The neighboring cell or relay of the three predetermined conditions is used as the target source; otherwise, the camped cell is selected as the target source; and the third predetermined condition is met: the reference signal strength is greater than the reference signal strength of the camped cell, and the difference is greater than The duration of the four thresholds exceeds the third time threshold.
The method of claim 6 wherein said third threshold is greater than said fourth threshold.
The method according to claim 6 or 7, wherein the D2D transmitting user equipment determines whether the priority of the camping cell is greater than the priority of the neighboring cell and the relay, including:

The D2D sending user equipment determines whether the reference signal strength of the camped cell is greater than a first threshold;

If the reference signal strength of the camping cell is greater than the first threshold, the D2D transmitting user equipment selects the camping cell as the target source;

If the reference signal strength of the camping cell is less than or equal to the first threshold, the D2D transmitting user equipment determines whether the priority of the camping cell is greater than the priority of the neighboring cell and the relay.
The method according to any one of claims 1 to 3, 5 to 7, wherein the reference signal of the source comprises: a cell reference signal.
The method according to any one of claims 1 to 3, 5 to 7, wherein the source comprises: a camping cell, a neighboring cell and a relay.
The method of claim 10 wherein the priority of the source is pre-configured or camped on the cell broadcast.
A method according to claim 10 or 11, wherein:

The priority of the camping cell is greater than the priority of the neighboring cell, and the priority of the neighboring cell is greater than the priority of the relay; or

The priority of the camping cell is equal to the priority of the neighboring cell, which is greater than the priority of the relay; or

The priority of the camping cell, the neighboring cell, and the relay is the same.
A D2D transmitting user equipment, comprising:

a target source selection module, configured to select a target source according to a reference signal strength of the source corresponding to the D2D transmission resource pool and/or a priority of the source;

The resource pool selection module is configured to select a corresponding D2D transmission resource pool according to the reference signal strength and/or priority of the target source.
The D2D transmitting user equipment according to claim 13, wherein the target source selecting module is configured to:

Determining whether the reference signal strength of the neighboring cell or the relay meets the first predetermined condition, where the satisfying the first predetermined condition is: the reference signal strength is greater than the reference signal strength of the camping cell, and the difference is greater than the second threshold The duration exceeds the first time threshold;

If the reference signal strength of the neighboring cell or the relay satisfies the first predetermined condition, the neighboring cell or the relay is selected as the target source;

If the reference signal strength of the neighboring cell or the relay does not meet the first set condition, the camped cell is selected as the target source.
The D2D transmitting user equipment according to claim 14, wherein the second threshold value is a signal strength offset value corresponding to the D2D resource selection.
The D2D transmitting user equipment according to claim 14 or 15, wherein when the reference signal strength of the neighboring cell or the relay satisfies the first predetermined condition, the target source selecting module is configured to:

Determining whether the reference signal strength of the camped cell is greater than the first threshold;

If the reference signal strength of the camping cell is greater than the first threshold, the camping cell is selected as the target source;

If the reference signal strength of the camping cell is less than or equal to the first threshold, it is determined whether the reference signal strength of the neighboring cell or the relay satisfies the first predetermined condition.
The D2D transmitting user equipment according to claim 13, wherein the target source selecting module is configured to:

According to the priority of the source corresponding to the D2D sending resource pool, the source with the highest priority is selected as the target source.
The D2D transmitting user equipment according to claim 13, wherein the target source selecting module is configured to:

Determining whether the priority of the camped cell is greater than the priority of the neighboring cell and the relay;

If the priority of the camping cell is greater than the priority of the neighboring cell and the relay, determining whether there is a neighboring cell or a relay whose reference signal strength satisfies the second predetermined condition, and if so, selecting a neighbor whose reference signal strength satisfies the second predetermined condition The cell or the relay is used as the target source, otherwise, the camped cell is selected as the target source; the second predetermined condition indication is met: the reference signal strength is greater than the reference signal strength of the camped cell, and the difference is greater than the third threshold The time exceeds the second time threshold;

If the priority of the camping cell is less than or equal to the priority of the neighboring cell or the relay, determine whether there is a reference signal strength. Satisfying the third predetermined condition, if yes, selecting a neighboring cell or relay whose reference signal strength satisfies the third predetermined condition as the target source; otherwise, selecting the resident cell as the target source; satisfying the third predetermined condition means, referencing The signal strength is greater than the resident cell reference signal strength, and the duration of the difference greater than the fourth threshold exceeds a third time threshold.
The D2D transmitting user equipment according to claim 18, wherein the third threshold is greater than the fourth threshold.
The D2D transmitting user equipment according to claim 18 or 19, wherein when the priority of the camping cell is greater than the priority of the neighboring cell and the relay, the target source selecting module is configured to:

Determining whether the reference signal strength of the camped cell is greater than the first threshold;

If the reference signal strength of the camping cell is greater than the first threshold, selecting the camping cell as the target source;

If the reference signal strength of the camping cell is less than or equal to the first threshold, it is determined whether the priority of the camping cell is greater than the priority of the neighboring cell and the relay.
The D2D transmitting user equipment according to any one of claims 13 to 15, 17 to 19, wherein the reference signal of the source comprises: a cell reference signal.
The D2D transmitting user equipment according to any one of claims 13 to 15, 17 to 19, wherein the source comprises: a camping cell, a neighboring cell, and a relay.
The D2D transmitting user equipment according to claim 22, wherein the priority of the source is pre-configured or camped on the cell broadcast.
The D2D transmitting user equipment according to claim 22 or 23, characterized in that:

The priority of the camping cell is greater than the priority of the neighboring cell, and the priority of the neighboring cell is greater than the priority of the relay; or

The priority of the camping cell is equal to the priority of the neighboring cell, which is greater than the priority of the relay; or

The priority of the camping cell, the neighboring cell, and the relay is the same.